Fix reversed check

[nbbrooks]

Description

Ran into this bug and found the moveit1 fix!

Port of moveit/moveit#2787

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

[codecov]

Codecov Report

Merging #623 (e243232) into main (86ac9c9) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #623      +/-   ##
==========================================
- Coverage   54.13%   54.11%   -0.01%     
==========================================
  Files         190      190              
  Lines       20037    20037              
==========================================
- Hits        10845    10842       -3     
- Misses       9192     9195       +3     

Impacted Files	Coverage Δ
.../planning_scene_monitor/src/trajectory_monitor.cpp	0.00% <0.00%> (ø)
...dl_kinematics_plugin/src/kdl_kinematics_plugin.cpp	74.72% <0.00%> (-1.13%)	⬇️

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